Abstract
Broadband infrared luminescence from bismuth-doped germanium oxide glasses prepared by a conventional melting–quenching technique was discovered. The absorption spectrum of the glasses covered a wide range from the visible to the near-infrared wavelength regions and consisted of five broad peaks below 370, 500, 700, 800, and 1000 nm. The fluorescence spectrum exhibited broadband characteristics (FWHM) greater than 300 nm with a maximum at 1300 nm pumped by an 808-nm laser. The fluorescence lifetime at room temperature decreased with increasing concentration in the glass. Codoping of aluminum and bismuth was indispensable for the broadband infrared luminescence in , Al glass.
© 2004 Optical Society of America
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